Does anybody happen to know what the sizes of the orings for a Hammer are? They're quite thick compared to other markers. They're also different from other nelson style pumps (and even just that fact that they have orings in places). Any ideas?

I am currently waiting on two vendors to correctly identify the size and material type so that I may purchase some and let others know where they can get them. I am usually found on the MCB forums and will more than likely post my findings there.

Thanks for posting this. I've been contacting people since this posting and most of them say that they don't carry them due to the fact that Kingman hans't released a specs sheet for it so they can't produce them. Also I don't have the original o-rings to give to them as samples. Thanks again for your diligence and response.